> A random car from a 2nd hand car lot with a mystery custom firmware? Oh hellllllll no. Just like any random car can have a $100 GPS tracker or spy microphone

> A random car from a 2nd hand car lot with a mystery custom firmware? Oh hellllllll no. Just like any random car can have a $100 GPS tracker or spy microphone hidden which you won't locate without dismantling the entire car. If someone wants to spy or be nefarious with a car I can think of many easier & cheaper ways than making custom firmware for the radio.